US6457792B1 - Method for effecting actions over vertical surfaces - Google Patents
Method for effecting actions over vertical surfaces Download PDFInfo
- Publication number
- US6457792B1 US6457792B1 US09/450,467 US45046799A US6457792B1 US 6457792 B1 US6457792 B1 US 6457792B1 US 45046799 A US45046799 A US 45046799A US 6457792 B1 US6457792 B1 US 6457792B1
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- US
- United States
- Prior art keywords
- effector
- effector platform
- platform
- lengths
- vertical plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000012636 effector Substances 0.000 claims abstract description 174
- 239000000725 suspension Substances 0.000 abstract description 19
- 238000004804 winding Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D9/00—Recording measured values
- G01D9/40—Producing one or more recordings, each recording being produced by controlling either the recording element, e.g. stylus or the recording medium, e.g. paper roll, in accordance with two or more variables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
- B43L13/02—Draughting machines or drawing devices for keeping parallelism
- B43L13/022—Draughting machines or drawing devices for keeping parallelism automatic
- B43L13/024—Drawing heads therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
Definitions
- the present invention relates generally to performing mechanical actions such as drawing or printing, and more particularly to a system for performing the mechanical actions such as drawing on and erasing whiteboards and other substantially vertical surfaces.
- Image capture technologies enable marks drawn on a surface to be captured in electronic form. These include the pressure-sensitive tablets such as the SMART Board from SMART Technologies, Inc. of Calgary, Alberta, Canada, location-sensitive surfaces accompanied by special pens such as the Liveboard from Xerox Corporation of Stamford, Conn., and Mimeo from Virtual Ink Corporation of Boston, Mass., Laser-based pen trackers such as the SoftBoard from Microfield Graphics, Inc. of Portland, Oreg., camera-based scanning such as the ZombieBoard from Xerox Corporation, and 1-dimensional scan bars such as the Copyboard from Xerox Corporation.
- the ZombieBoard is further described in U.S. Pat. No. 5,528,290 to Saund, entitled DEVICE FOR TRANSCRIBING IMAGES ON A BOARD USING A CAMERA BASED BOARD SCANNER.
- Image display technologies permit stored electronic images to be displayed on a large surface. These include plasma, active matrix, liquid crystal, light-emitting diode, and projectors which can be either front-projection or rear-projection. Of the various image display technologies, only the projectors are compatible with an inexpensive, passive, surface of variable and extensible size. All of the others require dedicated display hardware which is expensive and fixed in size.
- the present invention is a method for performing mechanical actions such as drawing on substantially vertical surfaces such as whiteboards.
- the present inventive environment is referred to as a Pendulum Whiteboard Printer.
- the term “pendulum” is chosen because the carriage for holding the effector that performs the mechanical action, called an effector platform, is suspended against the force of gravity by suspension wires. It is not a true pendulum in the x-y plane because two wires are used. While the present invention is referred to as a printer, no printing in the traditional meaning of the word is done. Rather, all marks are drawn by moving a marking element across the surface with an effector platform.
- the present invention utilizes an inexpensive mechanism for remotely generating images on whiteboards and other substantially vertical surfaces.
- image refers to any marking created by a marking element such as a dry-erase pen.
- the markings may be in the form of textual characters, straight or curved strokes, or any other types of marks that could be hand-drawn.
- An effector platform for holding an end effector such as the marking element.
- the effector platform is suspended by two wires from two spools placed near the upper, outer, boundaries of the surface to be marked on. The lengths of the two wires are adjusted to control the location of the effector platform over the surface to be marked on.
- These wires are typically wound on motorized spools permitting their lengths to be varied under computer control.
- the spools may be located above and beyond the ends of the target surface so that all parts of the surface are reachable. If needed, control signals to the effector platform can be provided through the wires using techniques well-known in the art. Power may be supplied to the effector platform through the wires or from an on-board battery.
- a calibration routine may be run so that the system knows the drawing area of and locations on the whiteboard.
- a calibration routine may be run so that the system knows the drawing area of and locations on the whiteboard.
- Such calibrations may be performed using any techniques known in the art. For example, one such calibration technique would be to move the effector platform to a known board location using feedback information such as video camera and resetting the coordinates describing the effector platform position.
- FIG. 1 is a block/perspective view diagram of a Pendulum Whiteboard Printer system according to the present invention.
- FIG. 2 is an elevation view diagram of a Pendulum Whiteboard Printer according to the present invention.
- FIG. 3 is an elevation view diagram of an effector platform according to the present invention.
- FIG. 4 is flowchart depicting an overall operation of the Pendulum Whiteboard Printer according to the present invention.
- FIG. 5 is flowchart depicting an operation according to the present invention for moving an effector platform to generate an image.
- FIG. 1 depicts the Pendulum Whiteboard Printer 100 which forms the environment of the present invention in perspective view, including some functional block elements.
- the Pendulum Whiteboard Printer system is discussed in greater detail in concurrently filed, co-assigned, U.S. patent application Ser. No. 09/450,468 entitled SYSTEM FOR EFFECTING ACTIONS OVER VERTICAL SURFACES, which is hereby incorporated by reference into the present specification.
- An end effector 130 such as marking pen or the like is used for creating images on a whiteboard 105 .
- a dry-erase marker will typically be used for whiteboards.
- the present invention is not limited to marking on whiteboards, but may be used with any substantially-vertical surface, and that the action performed by the whiteboard printer is not limited to simply making marks, but may also be used for performing other actions, as will be discussed in greater detail below.
- the vertical surface will be referred to herein as a whiteboard.
- the marking element, or end effector 130 is held in place and moved with an effector platform 120 , which is suspended from a left wire 114 and a right wire 112 .
- the left wire 114 is connected to a left spool 108
- the right wire 112 is connected to a right spool 110 .
- the left and right spools are motorized to control the reeling in and unreeling of wire from the spool.
- the effector platform can be returned to a parking facility 170 for storing end effectors, among other reasons.
- the effector platform and parking facility are discussed in greater detail in concurrently filed, co-assigned, patent applications, U.S. Pat. No. 6,367,902 entitled EFFECTOR PLATFORM FOR PERFORMING ACTIONS OVER VERTICAL SURFACES and U.S. Pat. No. 6,368,002 entitled PARKING MECHANISM FOR END EFFECTORS USED FOR PERFORMING ACTIONS OVER VERTICAL SURFACES, respectively, both of which are hereby incorporated by reference into the present specification.
- the whiteboard printer 100 will typically be controlled by a computer 102 , through a controller 104 , which may be implemented in hardware or software, and may be a separate unit or part of the computer 102 . Alternatively, the whiteboard printer 100 may be controlled using a joystick 106 that is coupled through controller 104 .
- the computer 102 operates under the control of Operating System (OS) 1021 and may be any general-purpose computer known in the art.
- OS Operating System
- the computer 102 communicates with the whiteboard printer 100 through the controller 104 by way of an interface 103 , which may be any commonly-used computer communication interface such as a parallel or a serial interface.
- a camera 150 may be used to provide feedback information to the computer 102 , as depicted, or directly to the controller 104 .
- the calculations described below for positioning the effector platform 120 may be performed by the computer 102 and/or the controller 104 and may be implemented in software and/or hardware.
- the method of the present invention will preferably be implemented in software as computer-executable instructions, but may also be implemented in various embodiments of hardware.
- Driver programs 1023 for application programs 1022 for such applications as word processing, spreadsheets, and presentation graphics, among others, may be provided to generate their respective outputs on large vertical surfaces.
- the effector platform 120 may be moved to any position beneath and between the left spool 108 and right spool 110 by adjusting the lengths of the left and right wires 114 and 112 , respectively.
- the left and right spools 108 and 110 are preferably placed above the top edge of the whiteboard and beyond the left and right edges of the whiteboard, respectively, as shown in FIG. 1 . The positioning of the effector platform 120 will be discussed in greater detail below.
- the left spool 108 and right spool 110 are used to wind and unwind the respective connected left suspension wire 114 and right suspension wire 112 to thereby lengthen and shorten the suspension wire between the respective spool and the effector platform. This is referred to as open loop positioning of the effector platform.
- the lengths of the wires are adjusted by turning the spools to wind or unwind measured lengths of wire. Since the circumference of the spools is known, it is a simple matter to determine the number turns required to reel in or out a particular length of wire.
- a point p 1 on effector platform 120 denotes a projected intersection of the left wire 114 and right wire 112 at a given (x,y) location over the whiteboard 105 .
- l is the horizontal distance between the support motors.
- the two spools are assumed to be at the same height. Those skilled in the art will readily appreciate that the spools need not be at the same height, but may be placed at any height relative to one another, and that the calculations would be altered to account for the vertical offset.
- Fine tuning of the wire lengths w l and w r of left wire 114 and right wire 112 , respectively, is then required for open-loop positioning of the pen or other effector at the target (x, y) location. This depends on the rotation angle ⁇ that the platform takes, as shown in FIG. 3, due to the tension or force vector T l produced by the left suspension wire 114 , and the tension or force vector T r produced by the right suspension wire 112 .
- T r ⁇ cos ⁇ ⁇ ⁇ r T l ⁇ cos ⁇ ⁇ ⁇ l ( Lateral ⁇ ⁇ component )
- T r T l ⁇ cos ⁇ ⁇ ⁇ l cos ⁇ ⁇ ⁇ r
- T l mg sin ⁇ ⁇ ⁇ l + cos ⁇ ⁇ ⁇ l ⁇ tan ⁇ ⁇ ⁇ r ( 5 )
- T r mg sin ⁇ ⁇ ⁇ r + cos ⁇ ⁇ ⁇ r ⁇ tan ⁇ ⁇ ⁇ l ( 6 )
- m is the mass of the effector platform and g is the acceleration due to gravity.
- ⁇ and ⁇ are the upper right and upper left interior angles of the triangle formed by the support locations and the center of gravity of the effector platform, and l l and l r are the lengths of the sides of this triangle, as shown in FIG. 3 .
- d is the distance between the suspension wire attachment points on the platform.
- the effector platform 120 may be positioned precisely to within 6 mm, which will likely be sufficient for most applications.
- alternative wire measurement mechanisms may be employed, and/or feedback information may be used for closed-loop positioning, which will be described in greater detail below.
- a left wire motion sensor 107 is mounted between the whiteboard 105 and the left spool 108
- a right wire motion sensor 109 is mounted between the whiteboard 105 and the right spool 110 .
- the open-loop effector platform positioning described above may be augmented by feedback from external sensor information in order to achieve fine scale positioning, or when the effector platform needs to be positioned with respect to objects or markings on the surface whose exact coordinates are not known.
- the motors turning the wire spools are controlled through a feedback loop.
- the two suspension wires 114 and 112 can serve to provide both power and control signals to the effector platform 120 .
- a slip-ring (not shown) or electrically conductive roller (not shown) at each spool one of the suspension wires is made to supply power and the other as a ground. These voltages may be modulated such as with high-frequency signals carrying control information to the effector platform.
- the on-board electronics 140 of the effector platform demodulate the signal from the power voltage using simple electronics. The signal itself is used by the onboard electronic controller to activate motors, solenoids, lights, etc.
- power may be supplied to the effector platform through an on-board battery (not shown).
- a battery can be advantageous in not requiring power to be transmitted down the suspension wires, which will allow different materials to be used as the wire as well as reduce the signal noise on the those wires, assuming signals are also transmitted down the suspension wires.
- the Pendulum Whiteboard Printer 100 may be used to move an effector platform 120 from one location to another and to perform an action using an end effector 130 .
- the Pendulum Whiteboard Printer may be calibrated at any time, as shown in step 400 , such as by positioning the effector platform at a known physical location and resetting the Pendulum Whiteboard Printer's coordinate space reference.
- the end effector action may be any number of different actions. For example, where the end effector is a marking pen, the action will be one of retracting the pen from the whiteboard surface so the effector platform can move to a next location without drawing a line and extending the pen to the whiteboard surface so the effector platform can draw a line while it moves to the next location.
- Robotic gripper, paint sprayer, and other end effectors may have additional or completely different actions as appropriate.
- the effector platform is moved to the parking facility 170 where the end effectors are stored, at step 420 and the current end effector is exchanged for the desired end effector, at step 425 .
- the effector platform is then moved back to its last position, at step 430 , and the end effector action is performed, at step 415 . After performing the end effector action, processing returns to step 405 .
- step 405 If, at step 405 , no end effector action is required, a further determination is made, at step 435 , as to whether a new location for the effector platform is specified, i.e., whether there is any more data. If a new location is specified, the effector platform is moved to the new location, at step 440 , and processing returns to step 405 . If, at step 435 , there is no more data, the effector platform is moved to the parking facility, at step 445 , and processing ends.
- the moving of the effector platform is performed by determining the current position of the effector platform in terms of a left wire length w l and a right wire length w r , at step 505 .
- the left and right wire lengths corresponding to the next location for the effector platform are determined at step 510 .
- the effector platform is move to the next location by adjusting the lengths of the left and right suspension wires 114 and 112 to the determined left and right wire lengths corresponding to the next location at step 515 .
- steps 420 through 430 may be implemented simply by retracting the current end effector and extending the desired end effector.
- retracting refers to moving an end effector away from the whiteboard surface
- extending refers to moving the end effector toward the whiteboard surface.
- the Pendulum Whiteboard Printer is used to place a mark next to entries that are known to be out of date or incorrect.
- An exemplary IN/OUT board application is discussed in greater detail in two co-assigned patent applications to Moran et al., U.S. Ser. No. 09/156,033 and U.S. Ser. No. 09/156,031, which were filed on Sep. 17, 1998, hereby incorporated by reference into the present application.
- the Pendulum Whiteboard Printer can be used to print musical staff lines or rule lines onto a whiteboard in an instructional, expository, or exploratory setting.
- the Pendulum Whiteboard Printer can be used copy hand-drawn material or printed line-art such as maps and engineering diagrams from a paper or electronic source onto a whiteboard.
- the Pendulum Whiteboard Printer can be used copy material from one part of a whiteboard to another.
- Pendulum Whiteboard Printer In settings where a very large whiteboard is used as a reference board the Pendulum Whiteboard Printer enables numbers and text to be written at locations that are difficult for human users to reach. Such settings include open marketplaces, schedule rooms, and operations planning centers.
- a scaled-up version of the Pendulum Whiteboard Printer is useful as a robotic device for washing windows on large buildings.
- the effectors in this application may be a hose for delivering water or other cleaner and a squeegee, or may be any other combination of a cleaner delivery system and a cleaning element.
- a scaled-up version of the Pendulum Whiteboard Printer is applicable to painting sides of building, billboards, and other large surfaces.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Drawing Aids And Blackboards (AREA)
Abstract
Description
Claims (5)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/450,467 US6457792B1 (en) | 1999-11-29 | 1999-11-29 | Method for effecting actions over vertical surfaces |
JP2000348630A JP4598259B2 (en) | 1999-11-29 | 2000-11-15 | How to operate on a vertical plane |
CA002326490A CA2326490C (en) | 1999-11-29 | 2000-11-22 | Method for effecting actions over vertical surfaces |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/450,467 US6457792B1 (en) | 1999-11-29 | 1999-11-29 | Method for effecting actions over vertical surfaces |
Publications (1)
Publication Number | Publication Date |
---|---|
US6457792B1 true US6457792B1 (en) | 2002-10-01 |
Family
ID=23788217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/450,467 Expired - Lifetime US6457792B1 (en) | 1999-11-29 | 1999-11-29 | Method for effecting actions over vertical surfaces |
Country Status (3)
Country | Link |
---|---|
US (1) | US6457792B1 (en) |
JP (1) | JP4598259B2 (en) |
CA (1) | CA2326490C (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030095113A1 (en) * | 2001-11-21 | 2003-05-22 | Yue Ma | Index and retrieval system and method for scanned notes from whiteboard |
CN104589331A (en) * | 2015-01-24 | 2015-05-06 | 江西省机械科学研究所 | Gear-driven electric cylinder three-dimensional translational manipulator |
CN105034657A (en) * | 2015-07-30 | 2015-11-11 | 深圳市创客工场科技有限公司 | Drawing device |
US20180009103A1 (en) * | 2014-12-19 | 2018-01-11 | Fundación Tecnalia Research & Innovation | Planar motion device |
US10401878B2 (en) | 2013-05-09 | 2019-09-03 | Terydon, Inc. | Indexer, indexer retrofit kit and method of use thereof |
US10408552B2 (en) * | 2013-05-09 | 2019-09-10 | Terydon, Inc. | Indexer, indexer retrofit kit and method of use thereof |
IT201800004529A1 (en) * | 2018-04-16 | 2019-10-16 | Vertical plotter with improved print head | |
US10890390B2 (en) | 2013-05-09 | 2021-01-12 | Terydon, Inc. | Indexer, indexer retrofit kit and method of use thereof |
US11327511B2 (en) | 2013-05-09 | 2022-05-10 | Terydon, Inc. | Indexer, indexer retrofit kit and method of use thereof |
US11360494B2 (en) | 2013-05-09 | 2022-06-14 | Terydon, Inc. | Method of cleaning heat exchangers or tube bundles using a cleaning station |
US11733720B2 (en) | 2016-08-30 | 2023-08-22 | Terydon, Inc. | Indexer and method of use thereof |
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CN107253423A (en) * | 2017-08-13 | 2017-10-17 | 重庆凌慧科技有限公司 | A kind of automatic auto-portrait robot |
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US11327511B2 (en) | 2013-05-09 | 2022-05-10 | Terydon, Inc. | Indexer, indexer retrofit kit and method of use thereof |
US11709507B2 (en) | 2013-05-09 | 2023-07-25 | Terydon, Inc. | Method of performing a cleaning operation using a water jet device |
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CN104589331A (en) * | 2015-01-24 | 2015-05-06 | 江西省机械科学研究所 | Gear-driven electric cylinder three-dimensional translational manipulator |
CN105034657A (en) * | 2015-07-30 | 2015-11-11 | 深圳市创客工场科技有限公司 | Drawing device |
US11733720B2 (en) | 2016-08-30 | 2023-08-22 | Terydon, Inc. | Indexer and method of use thereof |
EP3556571A1 (en) * | 2018-04-16 | 2019-10-23 | Makr Shakr Srl | Vertical plotter with an improved printing head |
IT201800004529A1 (en) * | 2018-04-16 | 2019-10-16 | Vertical plotter with improved print head |
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CA2326490A1 (en) | 2001-05-29 |
JP2001187500A (en) | 2001-07-10 |
CA2326490C (en) | 2005-01-11 |
JP4598259B2 (en) | 2010-12-15 |
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